How to discovering types exported by OSGi bundle without installing/activating?

Question

Basically i want to discover if a jar implements any number of interfaces wihtout activating or starting the bundle. Is it possible to read the meta data from the meta-inf f

Answer 1

you may try something like below. Find the ".class" files in the exported packages using bundle.findResource(...) method.

 BundleContext context = bundle.getBundleContext();
  ServiceReference ref = context.getServiceReference(PackageAdmin.class.getName());
  PackageAdmin packageAdmin = (PackageAdmin)context.getService(ref);
  List agentClasses = new ArrayList();
  ExportedPackage[] exportedPackages = packageAdmin.getExportedPackages(bundle);
  for(ExportedPackage ePackage : exportedPackages){
      String packageName = ePackage.getName();
      String packagePath = "/"+packageName.replace('.', '/');
      //find all the class files in current exported package
      Enumeration clazzes = bundle.findEntries(packagePath, "*.class", false);
      while(clazzes.hasMoreElements()){
       URL url = (URL)clazzes.nextElement();
       String path = url.getPath();
       int index = path.lastIndexOf("/");
       int endIndex = path.length()-6;//Strip ".class" substring
       String className = path.substring(index+1, endIndex);
       String fullClassName=packageName+"."+className;
       try {
     Class clazz = bundle.loadClass(fullClassName);
     //check whether the class is annotated with Agent tag.
     if(clazz.isAnnotationPresent(Agent.class))
      agentClasses.add(clazz);
    } catch (ClassNotFoundException e) { 
     e.printStackTrace();
    }
      }
  }